28801007 has 4 divisors (see below), whose sum is σ = 28821936. Its totient is φ = 28780080.

The previous prime is 28801001. The next prime is 28801033. The reversal of 28801007 is 70010882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28801007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28801001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8243 + ... + 11204.

It is an arithmetic number, because the mean of its divisors is an integer number (7205484).

Almost surely, 2^28801007 is an apocalyptic number.

28801007 is a deficient number, since it is larger than the sum of its proper divisors (20929).

28801007 is a wasteful number, since it uses less digits than its factorization.

28801007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20928.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 28801007 is about 5366.6569668649. The cubic root of 28801007 is about 306.5273454787.

Adding to 28801007 its reverse (70010882), we get a palindrome (98811889).

The spelling of 28801007 in words is "twenty-eight million, eight hundred one thousand, seven".